Simply the best location in Bangkok. You're on top of the MRT station (Sukhumvit) that's connected directly to the BTS (Asoke). Even when it's raining you can get anywhere only walking less than 100m under the open sky.
The airport rail link is only one MRT station away as well.
As for the condo, it has everything you need. Many little things are thought of from shampoo and body wash, to laundry detergent, to garbage bags and a kettle in the kitchen. The bedroom even has a TV if you want to bring an Apple TV or some other streaming device to use in there.
The condo staff is always very nice and will help you if you have any mail or packages sent to the condo during a long stay, and there is a dedicated area for food deliveries. There's a 7-12 vending machine and a Tao Bin machine in the lobby also.
There's a motorcycle taxi stand right at the end of the driveway.
Terminal 21 which is right next door has the cheapest mall food court in Bangkok.
Something you may not know when you stay is there's a little bit of a hidden door in the back that will take you into Sukhumvit Soi 19 so you really have direct access to a lot of shops over there too. You also have access to the roof on floor 51 but you'll need to use the other elevator lobby to get up there.
Communication was always great and Bon even picked me up directly from my test&go hotel and brought me up to the condo.
I'd love to stay here any time I visit Bangkok.